The United States Department of Homeland Security defines an active shooter as "an individual actively engaged in killing or attempting to kill people in a confined and populated area; in most cases, active shooters use firearms and there is no pattern or method to this selection of victims."[2]

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Workplace Violence 

As of 2019, there were 454 fatal workplace violence incidents a year in the United States and

Nearly 400,000 aggravated assaults occur in the workplace.

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School Shooting

More than 214,000 students experienced gun violence at 216 schools, and at least 141 children, educators and other people were killed and another 284 were injured. 38% of the students who experienced school shootings

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Healthcare Facilities Shootings

Additionally, the Annals of Emergency Medicine published a study that examined all U.S. hospital shootings between 2000 and 2011 in which there was at least one injured victim. It identified 154 incidents in 40 states causing death or injury to a staggering 235 people.

 

The Federal Bureau of Investigation has stated the number of “active shooter incidents across the US increased more than 50% in 2021 compared to 2020, and a 96.8% increase from 2017"

 

The casualties in 2021 represents the third highest total casualty count over the last five years (2017–2021). 2021 saw the highest number of deaths (103) since 2017, a 171.1% increase from 2020 and above the average (92.3) for the period 2017–2020. 

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Resources: https://www.dhs.gov     www.fbi.gov 

www.campussafetymagazine.com/hospital/responding-active-shooters

www.zippia.com/advice/workplace-violence-statistics/

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